Cita APA (7a ed.)
(1987). X/OPEN Portability Guide: System V Specification System Calls and Libraries. Elsevier.
Cita Chicago Style (17a ed.)
X/OPEN Portability Guide: System V Specification System Calls and Libraries. Amsterdam: Elsevier, 1987.
Cita MLA (9a ed.)
X/OPEN Portability Guide: System V Specification System Calls and Libraries. Elsevier, 1987.
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